Use image to make circuit board
I think the displacement map not working properly is a side effect of the colour in the image. You probably want to convert that into grayscale before using it as a displacement map.

Well, with a quick bit of photoshop work, here's what I came up with. It's not perfect and you can see the pixels if you zoom in a bit too much, but it works somewhat.

Displacement map:


Colour:


Node Setup:


Final Result:


Edit:

Typically you won't want to plug in the normal map node. I did that because there were some shading issues that cropped up in Eevee, and it seemed to fix it. In cycles, it works fine without the Normal Map node.